Unit I
Basic Electrical Fundamentals
, Contents
• 1.1 Electric and magnetic circuits.
• 1.2 Series and parallel magnetic circuits.
• 1.3 Faraday's laws of electromagnetic induction, Fleming's right-hand rule,
Lenz's law
• 1.4 Dynamically and statically induced emf, self and mutual inductance
• 1.5 AC and DC quantity, advantages of AC over DC supply.
• 1.6 Single phase AC, sinusoidal AC wave: instantaneous value, cycle, amplitude,
time period, frequency, angular frequency, RMS value, Average value for
sinusoidal waveform, form factor, peak factor.
• 1.7 Three phase supply system over single-phase supply system, Phase
sequence and balanced and unbalanced load
• 1.8 Star and delta connections, Phase and line current, phase and line voltage
in star connected and delta connected balanced system.
,1.1 Introduction
• A circuit is a type of network having a closed path for the flow of
either electric current or magnetic flux. A circuit mainly consists of
three major parts viz. source, path or conductor and load. In simple
words, the term circuit can be used to represent any fixed path
through which electricity, data, single or magnetic flux can flow.
• Depending on the type of quantity (electric current or magnetic flux),
the circuits can be of two types as −
1. Electric circuit
2. Magnetic circuit
, Electric circuit
• An electric circuit is a closed path through which electric current can flow. A typical
electric circuit consists of three main parts namely,
1. energy source such as cell, battery, generator, etc.,
2. connecting wires,
3. loads such as lamp, fan, etc.
• Depending upon the type of current flowing in the circuit,
the electric circuit is classified into two types as −
- DC circuit (a closed path followed by direct current)
- AC circuit (a closed path followed by alternating current)
• Based on the arrangement in which the circuit elements are connected, the electric
circuit can be classified into three types as −
1. Series circuit
2. Parallel circuit
3. Series and parallel circuit
Basic Electrical Fundamentals
, Contents
• 1.1 Electric and magnetic circuits.
• 1.2 Series and parallel magnetic circuits.
• 1.3 Faraday's laws of electromagnetic induction, Fleming's right-hand rule,
Lenz's law
• 1.4 Dynamically and statically induced emf, self and mutual inductance
• 1.5 AC and DC quantity, advantages of AC over DC supply.
• 1.6 Single phase AC, sinusoidal AC wave: instantaneous value, cycle, amplitude,
time period, frequency, angular frequency, RMS value, Average value for
sinusoidal waveform, form factor, peak factor.
• 1.7 Three phase supply system over single-phase supply system, Phase
sequence and balanced and unbalanced load
• 1.8 Star and delta connections, Phase and line current, phase and line voltage
in star connected and delta connected balanced system.
,1.1 Introduction
• A circuit is a type of network having a closed path for the flow of
either electric current or magnetic flux. A circuit mainly consists of
three major parts viz. source, path or conductor and load. In simple
words, the term circuit can be used to represent any fixed path
through which electricity, data, single or magnetic flux can flow.
• Depending on the type of quantity (electric current or magnetic flux),
the circuits can be of two types as −
1. Electric circuit
2. Magnetic circuit
, Electric circuit
• An electric circuit is a closed path through which electric current can flow. A typical
electric circuit consists of three main parts namely,
1. energy source such as cell, battery, generator, etc.,
2. connecting wires,
3. loads such as lamp, fan, etc.
• Depending upon the type of current flowing in the circuit,
the electric circuit is classified into two types as −
- DC circuit (a closed path followed by direct current)
- AC circuit (a closed path followed by alternating current)
• Based on the arrangement in which the circuit elements are connected, the electric
circuit can be classified into three types as −
1. Series circuit
2. Parallel circuit
3. Series and parallel circuit
